What are you having trouble with? Are you struggling to adjust to things like getting into orbit with the new balancing, or are you attempting new things like landing on other planets?

One thing I'd advise is to go in baby-steps, like a real space program. Don't try to send a 3-kerbal lander to Mun like in the demo, the redone scale of part sizes makes that a lot harder. First, safely land a tiny probe there, similar to the ones I made in that image I posted. The smaller your lander, the smaller and simpler your entire rocket has to be at launch. If you can manage that, then send a 1-kerbal lander as they're about the same size as the 3-kerbal craft in the demo.

Another trick is to try and land on Minmus before going to Mun. Minmus is slightly harder to get to as it's further away and requires a slight inclination change, but it is much, much easier to land on than Mun for three main reasons.

The gravity is much lighter, which makes a huge difference. Landing is slower-paced and it's easier to keep track of all the variables.

There are large "ice" lakes on Minmus that are perfectly flat, so you don't have to worry about landing on a slope.

The lakes are at 0m elevation, so you know exactly when you're coming in to land. On Mun, the surface is often several km higher than the readout says it is and you have to judge your descent with your eyes, which is an extra hassle you really don't need when still learning how to land.

In truth, Mun is actually one of the hardest bodies in the system to land on because it has relatively high gravity and no atmosphere. Moho, Vall, and Tylo are the only other bodies with no atmosphere and higher gravities than Mun.

I guess my problem is it seems so much harder to build the ships. With the demo you just slapped it together and it was fine. I find myself having a hard time just getting into orbit. I don't know if i'm going with to big a ship and trying to hard. I did download Mechjeb. It's easier using that.

I did manage to get Station Core that comes with the saves already in it. I't out of fuel and I just can't seem to get to it again. Even with a ship I made that gets into orbit fine. <-with extra fuel no less.

I guess my problem is it seems so much harder to build the ships. With the demo you just slapped it together and it was fine. I find myself having a hard time just getting into orbit. I don't know if i'm going with to big a ship and trying to hard. I did download Mechjeb. It's easier using that.

I did manage to get Station Core that comes with the saves already in it. I't out of fuel and I just can't seem to get to it again. Even with a ship I made that gets into orbit fine. <-with extra fuel no less.

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Two things come to mind:

Are you using asparagus staging? It's the most fuel-efficient method of getting into orbit as you are dropping empty fuel tanks as they run out.

You may be travelling too fast after lifting-off. If you travel too fast in the thickest part of the atmosphere then you lose a lot of fuel in fighting against friction. You'll want to quickly get up to around 100m/s after lift-off, then slowly increase the speed after that so that you're travelling at 250m/s when you reach an elevation of 10,000m. It takes some getting used to, but it does save fuel.

As for intercepting other ships in orbit and docking with them, that's very tricky. Either watch Scott Manley's tutorial and practice, or let mechjeb do it for you.

I play sandbox. career mode doesn't really do anything besides delay your access to parts.

Get Mechjeb. It's a great addon that will greatly help in building and flying rockets. Even if you don't want mechjeb to do your flying for you, the information it provides is pretty essential in my opinion.